SAN FRANCISCO – Uber passengers in Pittsburgh will be able to summon rides in self-driving cars with the touch of a smartphone button in the next several weeks.

The high-tech ride-hailing company said Thursday that an unspecified number of autonomous Ford Fusions with human backup drivers will pick up passengers just like normal Uber vehicles. Riders will be able to opt in if they want a self-driving car, and rides will be free to those willing to do it, spokesman Matt Kallman said.

Uber, which has a self-driving research lab in Pittsburgh, has no immediate plans to deploy self-driving cars beyond the Pittsburgh experiment. But its CEO, Travis Kalanick, has said the ride-sharing company’s future — indeed, the future of all transportation — is driverless.

“When there’s no other dude in the car, the cost of taking an Uber anywhere becomes cheaper than owning a vehicle. So the magic there is, you basically bring the cost below the cost of ownership for everybody, and then car ownership goes away,” Kalanick said at the Code Conference in 2014, shortly after Google unveiled its self-driving car prototype.

The announcement was one of three made by Uber that accelerate the company’s quest to provide autonomous taxis to the public worldwide. It’s also the latest tie-up between Silicon Valley, ride-hailing firms and major automakers.

The San Francisco company announced a $300 million deal for Volvo to provide SUVs to Uber for autonomous vehicle research. Eventually the Volvo SUVs will be part of the self-driving fleet in Pittsburgh. Volvo will develop base vehicles for research and both companies will develop autonomous vehicles on their own.

Uber also announced that it is acquiring a self-driving startup called Otto that has developed technology allowing big rigs to drive themselves.

With the acquisition of Otto, Uber gets a fast infusion of self-driving expertise, including Otto co-founder Anthony Levandowski, one of the founding fathers of autonomous technology.

Self-driving cars are not yet ready for the masses. Hurdles include software that is not yet good enough for public rollout, safety concerns raised by state and federal regulators, and uncertainty over society’s readiness to trust robot drivers.

But the race is on. Large tech and auto companies suggest they could start selling self-driving cars within three to five years.

If history is any guide, that push will begin with high-end models that few people can afford. Uber’s vast on-demand auto fleet could presumably bring the technology to ordinary people more quickly.

Uber, however, isn’t alone in the race for autonomous vehicles. It’s not even a leader.

The company’s primary U.S. competitor, Lyft, received a $500 million investment from GM earlier this year. Those two companies said they plan to put self-driving vehicles into Lyft’s fleet on a small scale sometime in the next year. GM also bought itself some self-driving expertise in March with the acquisition of a company called Cruise Automation.

This week, Ford Motor Co. announced — in Silicon Valley, not Detroit — that it intends to have a self-driving vehicle on the road by 2021. The car will have neither a steering wheel nor pedals and will be rolled out for commercial ride-hailing services, not directly to consumers.

Google’s parent company Alphabet Inc. is even further ahead in pursuing driverless cars that offer passengers little control beyond an emergency stop button. Google began testing its fleet of prototype self-driving cars on public roads in 2009.

Though the Google car project just lost its director, Chris Urmson, it has a big head start. Its leaders have suggested they could launch public pilot tests of cars with no steering wheels or pedals in the next year or two.

Putting robotic vehicles on the road has been an obsession for Levandowski. One earlier effort, a self-driving motorcycle named Ghostrider, is now in the Smithsonian’s National Museum of American History.

Until the start of this year, Levandowski was at Google, but he left to found Otto with two other former Google employees.

After outgrowing the leafy Palo Alto neighborhood where they worked on their first rigs, Levandowski moved his headquarters to San Francisco and came out of stealth mode by posting a video of a truck driving itself down a Nevada highway. An actor sitting at a table in the cab jots notes on a pad of paper.

Levandowski’s business proposition was straightforward. Big rigs spend most of their time on highways, making them a relatively easy problem to solve. Unlike bustling city streets, highways have well marked lanes, little or no cross traffic, and other features that make them far easier for a self-driving vehicle to navigate.

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